Sponge for substrate cleaning



FIG. 1 is a bottom-right perspective view of a sponge for substrate cleaning showing my new design;

FIG. 2 is a top-right perspective view observed from a bottom thereof;

FIG. 3 is a front view thereof, a rear view being identical thereto;

FIG. 4 is a right-side view thereof, a left-side view being identical thereto;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a sponge for substrate cleaning, as shown and described. 